Ditrigona concava Guo & Han, 2022

Guo, Xiao-Jiang, Cheng, Rui, Jiang, Shan, Xue, Da-Yong & Han, Hong-Xiang, 2022, Four new species of Ditrigona Moore (Lepidoptera, Drepanidae) in China and an annotated catalogue, ZooKeys 1091, pp. 57-98 : 57

21. Ditrigona concava Guo & Han sp. nov.

Figs 23 , 66 , 100 , 133

Description.

Characters of head and thorax in male same as in D. sinespina . Forewing length 16 mm in male. Fore- and hind wings white, transverse lines grey. Forewing with costa pale brown. Subbasal line slightly bent inwards at middle and costa; antemedial line straight and only bent inwards near costa; postmedial line broad, almost straight; submarginal line double, the inner one slightly wavy and the outer one deeply wavy. Hind wing with antemedial line slightly convex at middle, bent outwards and merging into the elongate grey area along the anal margin; postmedial line broader, almost straight, slanting outwards and closing to meet submarginal line near anal angle, forming large pointed teeth on CuA2 and anal fold; submarginal line double, with the inner one nearly straight and only wavy near anal angle, the outer one wavy, the two lines gradually approximating towards anal margin. Anal margin less extended, with a quite short tail process, longer in the female, with a small black patch. Fringes pale brown. Forewing underside with costa deep brown in basal half.

Male genitalia. Uncus bifurcate over its whole length, both arms slender. Socii large, terminally semicircular, rough apically. Valva small, distal and posterior margin shallowly concave, posterior protrusion rounded. Saccus blunt and rounded. Juxta large, slightly sclerotized, indistinctly shaped. Aedeagus stout, terminal part narrow; cornutus an oblong spinose patch. Eighth tergite quadrate, posterior margin almost straight; eighth sternite shallowly concave, with two small lateral protrusions.

Female genitalia. Unknown.

Diagnosis.

The most distinctive character of D. concava lies in the male eighth sternite, which is different from all other congeners by the wide and shallow concavity, bearing two small lateral processes. The male genitalia are similar to those of D. tenuiata and D. sinespina , and can be differentiated by the following differences: the uncus is longer than in those two species; the distal and posterior margins of the valva are shallowly concave in D. concava , but the two margins are straight in D. sinespina .

Type material.

Holotype, ♂, China: Yunnan (IZCAS): Ailao Shan, 2600 m, 11.VIII.2011, leg. Kitching Ashton, slide no. Drep-1095, ARB00027811, ex. XTBG. Paratype: 1♂, Yunnan (IZCAS): Weixi, Tacheng, 2800 m, 13-14.VII.2014, leg. Li Xinxin, slide no. Drep-1091, M32975.

Distribution.

China (Yunnan).

Etymology.

The species is named after the Latin word concavus, which refers to the shallowly concave 8th male sternite.

Molecular data.

An intraspecific distance of D. sinespina of 2.07% (n = 2) was recorded. The nearest related species is D. parva , with a genetic distance of 9.56%.

Figures

Figures 1 - 27. Adults of Ditrigona 1 D. derocina, male 2 D. diana, male 3 D. crystalla, holotype, male 4 D. spilota, male, ZFMK 5 D. furvicosta, male 6 D. jardanaria, male 7 D. media, paratype, male, ZFMK 8 D. sericea, male 9 D. sericea, male (Auzatella pentesticha Chu & Wang, allotype) 10 D. pentesticha, holotype, female 11 D. q. erminea, holotype, male, ZFMK 12 D. q. spodia, holotype, male, ZFMK 13 D. q. leucophaea, holotype, male, ZFMK 14 D. obliquilinea thibetaria, male 15 D. triangularia, lectotype, male 16 D. uniuncusa, male 17 D. tenuiata, holotype, male 18 D. regularis, male 19, 20 D. sinespina sp. nov., 19 holotype, male 20 paratype, female 21, 22 D. parva sp. nov., 21 holotype, male 22 paratype, female 23 D. concava sp. nov., holotype, male 24 D. titana, holotype, male, ZFMK 25 D. pomenaria male 26 D. polyobotaria, holotype, female, ZFMK 27 D. typhodes, male. Scale bar: 1 cm.

Figures 64 - 74. Male genitalia of Ditrigona 64 D. sinespina sp. nov., holotype 65 D. parva sp. nov., holotype 66 D. concava sp. nov., paratype 67 D. titana, ZFMK 68 D. pomenaria 69 D. typhodes 70 D. lineata lineata 71 D. artema 72 D. candida, paratype, ZFMK 73 D. chionea 74 D. fusca sp. nov., holotype. Scale bars: 1 mm.

Figures 90 - 106. Aedeagus of Ditrigona 90 D. sericea (Auzatella pentesticha Chu & Wang, allotype) 91 D. quinaria erminea, ZFMK 92 D. quinaria spodia 93 D. obliquilinea thibetaria 94 D. triangularia 95 D. uniuncusa 96 D. tenuiata, holotype 97 D. regularis 98 D. sinespina sp. nov., holotype 99 D. parva sp. nov., holotype 100 D. concava sp. nov., paratype 101 D. titana, ZFMK 102 D. pomenaria 103 D. typhodes 104 D. lineata lineata 105 D. artema 106 D. candida, ZFMK. Scale bars: 1 mm.

Figures 128 - 151. Eighth segment of Ditrigona 128 D. uniuncusa 129 D. tenuiata, holotype 130 D. regularis 131 D. sinespina sp. nov., holotype 132 D. parva sp. nov., holotype 133 D. concava, paratype 134 D. titana, ZFMK 135 D. pomenaria 136 D. typhodes 137 D. lineata lineata 138 D. artema 139 D. candida, ZFMK 140 D. chionea 141 D. fusca, sp. nov., holotype 142 D. conflexaria micronioides 143 D. margarita 144 D. berres 145 D. chama 146 D. platytes 147 D. clavata 148 - 151 D. cirruncata 148 from Shaanxi 149 - 150 from Emei Shan, Sichuan 151 from Zhejiang.